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Flux-closure domains in high aspect ratio electroless-deposited CoNiB nanotubes

by Michal Staňo, Sandra Schaefer, Alexis Wartelle, Maxime Rioult, Rachid Belkhou, Alessandro Sala, Tevfik Onur Menteş, Andrea Locatelli, Laurent Cagnon, Beatrix Trapp, Sebastian Bochmann, Sylvain Martin, Eric Gautier, Jean-Christophe Toussaint, Wolfgang Ensinger, Olivier Fruchart

Submission summary

As Contributors: Olivier Fruchart
Arxiv Link: https://arxiv.org/abs/1704.06614v2
Date accepted: 2018-10-21
Date submitted: 2018-05-21
Submitted by: Fruchart, Olivier
Submitted to: SciPost Physics
Domain(s): Experimental
Subject area: Condensed Matter Physics - Experiment

Abstract

We report the imaging of magnetic domains in ferromagnetic CoNiB nanotubes with very long aspect ratio, fabricated by electroless plating. While axial magnetization is expected for long tubes made of soft magnetic materials, we evidence series of azimuthal domains. We tentatively explain these by the interplay of anisotropic strain and/or grain size, with magneto-elasticity and/or anisotropic interfacial magnetic anisotropy. This material could be interesting for dense data storage, as well as curvature-induced magnetic phenomena such as the non-reciprocity of spin-wave propagation.

Current status:

Ontology / Topics

See full Ontology or Topics database.

CoNiB Magnetic domains Nanotubes Spin waves/magnons


Reports on this Submission

Anonymous Report 1 on 2018-8-3 Invited Report

  • Cite as: Anonymous, Report on arXiv:1704.06614v2, delivered 2018-08-03, doi: 10.21468/SciPost.Report.548

Strengths

1. complete study of magnetic nano tubes from the fabrication to magnetic imaging.
2. combination of two x-ray microscopy techniques and comparison to MOKE.

Weaknesses

1. A comparison between simulations and experiments would give a more detailed insight into the domain and domain wall structure.
2. The domain wall structure is not shown.
3. access to 3D information of the domains would be interesting.

Report

The Authors describe the fabrication, characterization and magnetic study of ferromagnetic nanotubes. They introduce the material systems and the imaging techniques used. They present the results clearly and draw the correct conclusions.

Requested changes

-

  • validity: high
  • significance: good
  • originality: high
  • clarity: high
  • formatting: excellent
  • grammar: excellent

Author Olivier Fruchart on 2018-08-23 (in reply to Report 1 on 2018-08-03)
Category:
answer to question

We appreciate the comment of the referee.

In the present manuscript we wished to report on a new material, displaying spontaneously azimuthal magnetization. Comment 3, and partly comment 1, are directly relevant for this concern. We fill that this comment is addressed in the manuscript by the following statement (page 7): "it is difficult to extract quantitatively the direction of magnetization in this series, because of the exponential decay of photon intensity inside matter, uncertainties in the dichroic coefficient, and the existence of a background intensity in the image. We can only provide an estimate of the $H_\mathrm{K}$ from the field for which all contrast vanishes in the corresponding images". While we could always attempt to reproduce the experimental STXM contrast, we fear that the several sources of uncertainties would prevent us from gaining more information than the fact that magnetization is azimuthal.

Comments 1 and 2 pertain to the domain wall structure. This is a very interesting focus, crucial for domain-wall motion under field or current. This topic is quite rich and not so simple. We have significant experiments and simulations on this topic, which we will put together in a dedicated manuscript. The aspects of the two comments will be largely covered.

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